The next vote in Iraq is the Oct. 15 referendum on the nation's constitution, but the political elite is already turning its attention to the general elections scheduled for December. Most Iraqi politicians now expect the constitution to be approved; fears have faded that Sunni Arabs might manage to vote it down. The optimism rises from several developments. First, as more and more Sunni Arabs read the proposed text, now widely distributed, they realize it is not as bad as some of their self-styled leaders claimed. The latest suicide-killer attacks have also come as a wake-up call to Sunnis not...